Fig. 4From: Upregulation of PD-1 expression on circulating CD8+ but not CD4+ T cells is associated with tuberculosis infection in health care workersExpression of PD-1 on T cells in latent TB-infected HCWs. A Gating strategies and representative results related to PD-1 expression on T cells. B Analysis of PD-1 expression differences between CD4+ T cells in QFT+ and QFT- groups. C Analysis of PD-1 expression differences between CD8+ T cells in QFT+ and QFT- groupsBack to article page